细胞毒素类抗肿瘤药物是（）

A.甲氨蝶呤

B.阿霉素

C.环磷酰胺

D.喜树碱

E.秋水仙碱

根据图画提示，完成对话。

A: Where's Bill? I can't find him.

B: I don't think he can    1    .

A: Why not?

B: He has to    2    .

A: What's wrong    3    ?

B: She doesn't feel    4    .

A: I'm sorry to     5   . Did she go and    6   ?

B: Yes.

A: What did the doctor     7   ?

B: The doctor said    8    but she has to rest.

1. ______ 2.______ 3.______ 4.______

5.______ 6.______ 7.______ 8.______